For the higher math involved: http://count.ucsc.edu/~rmont/papers/cat.PDF http://count.ucsc.edu/~rmont/papers/cat.PDF For the humor value: http://www.mentalflo

For the higher math involved: http://count.ucsc.edu/~rmont/papers/cat.PDF http://count.ucsc.edu/~rmont/papers/cat.PDF For the humor value: http://www.mentalfloss.com/blogs/archives/87351 http://www.mentalfloss.com/blogs/archives/87351